Valve-gear for locomotive-engines.



No. 657,8l6. Patented Sept. II, [900.

. G. B. EDDY.

VALVE GEAR FOR LCUMOTIVE ENGINES.

(Application led Apr. 28, 1900.

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GEORGE B. EDDY, OF OAMDEN, NEW JERSEY.

VALVE-G EAR FOR LOCONIOTIVE-ENGINES.

SPECIFICATION forming part of Letters Patent No. 657,816, dated september 11, 1900.

Application filed April 2s, 1900. serial No. 14,714. No moda.)

To all wwnt it nto/y concern:

Be it known that I, GEORGE B. EDDY, a citizen of the United States, and a resident of Camden, in the county of Camden and State of New Jersey, have invented a new and Improved Locomotive-Engine, of which the following is a full, clear, and exact description.

The object of the invention is to provide a new and improved locomotive-engine arranged to provide at all times a full exhaust no matter what position of cut-off the admission valves are in at the time, thus relieving the engine of all back pressure and at the same time allowing the motive agent to work expansively in the usual manner.

The invention consists of novel features and parts and combinations of the same, as will be fully described hereinafter and then pointed out in the claims.

A practical embodiment of the invention is represented in the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in both the views.

Figure l is a sectional side elevation of the improvement as applied, and Fig. 2 is an enlarged transverse section of the same on the 'line 2 2 in Fig. l.

The engine-cylinder A, in which reciprocates the piston A', is connected by ports c b with the interior of a steam-chest B, containing a valve-seat C for an exhaust slide-valve D, having the usual cavity c, and operating over branch ports a' b to insure full exhaust of the steam from the cylinder to the exhaustoutlet E no matter what position of cut-oit the admission-valves G G' are in at the time. The admission-valves G G' are mounted to slide in unison on extension valve-seats F F', respectively, through which extend the ports a b, as is plainly indicated in Fig. l, and said admission-valves are coupled together by a Valve-rod H, pivotally connected at I to the arm J of a rock-shaft K, connected by an arm T with a link-block S in a link U, controlled in the usual manner by the engineer, and connected with the eccentric-rods V V' of eccentric-straps W W', engaging eccentrics X X' for imparting the usual motion to the link, so as to move the admission-Valves G G on their valve-seats F F'. By the engineer raising or lowering the link U relatively to the block S a greater or less movement is given to the arm T and a corresponding movement to the admission-valves G G' to control the cut-off of the steamfroin Vthe steam-chest B to the ports o, b.

The exhaust-valve D is connected by a valve-rod N to an arm O, secured on an auxiliary rock-shaft P, carrying a depending arm Q, provided with pins R R', projecting from opposite faces of the arm, as indicated in Fig. 2. The pins R 'R" are adapted to be engaged by U shaped hooks Y Y',respectively,formed on the eccentric-rods V V', so that the particular hook engaging the pinRor R' imparts to the arm Q the full movement of the eccentric-rod regardless of the exhaust position of the hook relatively to the pin. For instance, when the hook Y is in engagement with the pin R it will be seen that the movement brought about by the eccentric X will be transmitted to the exhaust-valve D, and this movement will be substantially the same Whether the link U is raised or lowered to a certain limit, so Ylong as the hook is in engagement With its piu, thereby permitting the Varying of the throw of the admission-valves by the change of position of the link U relatively to the block S without, however, changing the throw of the exhaust-valve D, Vhen the engineer reverses the engine by lifting the link U, then the hook Y moves out of engagement .with the pin R, and the hook Y' moves in engagement with the other pin R', so that the movement of the eccentric-rod V' is transmitted by the hook Y' to the pin R' and the arm Q to rock the shaft P and to impart a sliding motion to the exhaust-valve D, the same as above described relatively to the hook Y engaging the pin R-that is, the exhaust-valve D receives a full stroke no matter what position of cut-off the link U is in or whether said link is in a lowermost or uppermost position for running the engine forward or backward.

From the foregoing it will be seen that steam will be admitted to the cylinder through the ports a h, and this admission of steam will be entirely controlled by the valves GG', while the dead steam will be exhausted through the branch ports ct' b' and the exhaust-valve D, so that the admission and exhaust are independent of each other. It will IOO further be seen that the throw of the exhaustvalve D remains fixed, while that of ther admission-valves G G is under the control of the engineer, so that the stroke may be varied for varying the point of cut-off for running the engine forward or backward.

By the arrangement described the admission-valves G G allow full admission of the steam to the cylinder, so 'that in starting or when doing heavy work the piston is acted upon by a full admission of steam. As the exhaust-valve has a full throw at all times there is no back pressure liable to occur in the cylinder, and at the same time the steam is free to expand in the cylinder, as the exhaust does not take place until the piston nears the end of its stroke.

The device is very simple and durable in construction and is not liable to get out of order, costs little for repairs, and insures better and easier running of the locomotive and without any jerking motion.

Having thus fully described my invention, I claim as new and desire to secure byLetters Patent- Y l. An engine havingadmission and exhaust valves having independent motion, the stroke of the exhaust-valve being fixed and that of the admission-valve variable, an eccentric mechanism, a link-motion actuated by said eccentric mechanism and controlling said admission-valve, and mechanism for operating the exhaust-valve from the eccentric mechanism to impart a full stroke to the exhaustvalve irrespective of the position of the said eccentric mechanism.

2. In an' engine, the combination with admission and exhaust valves, eccentric rods carrying a link, and means for operating the admission valves from the said link, of an exhaust valve operating mechanism, and means for operating the said mechanism from the eccentric-rods to impart a full stroke to the exhaust-valve irrespective of the position of said link, substantially as described.

3. In an engine, the combination with admission and exhaust valves, eccentrics, eccentric-rods carrying a link, and means for 'operating the admission-valves from the said link,of a rock-shaft provided with oppositelyprojecting arms, with one of which the eccentric rods are adapted to be alternately engaged, the other arm of the said shaft being connected with the exhaust-valve rod, substantially as described.

4. In combination with valves of the character described, a Valve mechanism consisting of two eccentrics, eccentric-rods connected thereto by straps, a link to which said eccentric-rods are attached, a block which said link embraces, an arm carrying the block, a rock-shaft to which said arm is secured, another arm carried by said rock-shaft, whereby motion is transmitted to the admissionvalves, a second rock-shaft, an arm projecting downward therefrom,pins projecting from said arm, hooks carried by the eccentric-rods forengaging said pins, and means for transmitting the motion of the hooks to the exhaust-valve, as specified.

5. A valve mechanism consisting of two eccentrics, eccentric-rods connected thereto by straps, a link to which said rods are pivoted, 'said link operating upon a block, for transmitting a variable motion to the admission- `valves, hooks carried by the eccentric-rods,

and mea'ns for transmitting a given motion from either eccentric from the hooks to the exhaust-valve, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

GEORGE B. EDDY. Witnesses:

FREEDOM C. LIPPINcoTT, HENRY D. CORNELL. 

